Pneumatic pressure-gage.



OLBEN. vPFIIUIL'II) PRESSURE GAGE. Y unicum: nun 901.. uros. 4 996,358, Patentel June 27,Y 1911.

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i panying drawings, in which- 20- OLE OLSEN, 0F FRUITVALE, CALIFORNIA.

PNEUMATIC PRESSURE-GAGE.

Specification of Letters Patent. Patented J une 27, 1911.

Application filed October 6, 1909. Serial No. 521,391.

To all .whom it may concern:

Be it known that I, 'OLE OLSEN, a citizen of the United States, residing at'Fruitvale4 in the county of Alameda and State of California, have inventednew and useful Improvements in Pneumatic Pressure-Gages, of which the following is aspecification.

M y invention relates to pneumatic pres- Sure gages.

It is especially designed for determining pressures, and is particularly applicable to determining pressure in the tires of auto mobiles, and in'lile places where air is held under compression,'and where it is desired to ascertain the exact amount of pressure,

It consists in a combination of parts, and in details of construction which will be more fully explained 4by reference to the accom- Figure 1 is an exterior view. Fig. 2 is a sectional elevation, showin of the device. F i 8 is a view of the piston or plunger, and t e adjusting means. Fig.` 4 is a section on line 4 4 Fig. 2.

A is a tube which may be made of glass or -other transparent material; or may have a portion made transparent for the purpose of inspection. The upper end of the tube is iclosed, and its sides are graduated with marks as at 2; these marks being determined by actual test and adapted to indicate the amount of compression attained within the tube, as 'will be hereafter described. Tithin the tube is a piston or plunder 3, and this plunger fits snuglywithin telle tube so that the body of air 1s confined between the plunger and the upper closed end of the tube. IT he lower end of the tube is adapted to be fitted to the art containing the fluid under pressure, an which pressure it is de- 4 sired to exactly ascertain.

It will vbe manifest that when the pressure is admitted into the lower end of the. tube it Will force the plunger upward, and will compress the air in the sealed upper portion of the tube until the two )ressnres are substantially equal. By reading the indicating marks onthe side of the tube', with which f marks the ltop of the plunger ',coincidcs, the

pansion of the air' in the upperpart of the tube will return the plunger to substantially its normal position.

For convenience of construction, und lo the application protect the fragile glass tube, I have shown anl exterior tube l which may be made of metal, hard rubber, 4or other suitable material. This tube has the sides made open as shown at 5y.

lVithin the tube near the lower washer 6, against which the lower end of the glass tube may fit, when it is inserted,

end, is a and thus form a lioint at this point. The upl' In order to maintain the plunger 3 tight,

and to regula e itin case of leakage, I have shown a cone8 which tits a conical depression in one end of the plunger 3. This' cone has a screw-threaded stem 9 which extends through the center of the plunger 3, and is adapted to receivea second cone Si1 which also lits in a corresponding depressionin that end of theplunger. This cou'e may `conveniently be' provided with a ring or loop 10 by which itl can be turned. rl`hc parts then being assembled, it willbc soon thatby screwing the cone 8 upon the stein 9, the two cones will be drawn toward` euch other, and the elastic plunger will be correspondingly expanded and caused to ii t as closely as'may be desired within the tubc. In this manner, if any leakage occurs or undesirable change in position ofthe plunger, the latter may be adjusted and made tight so that itV will again operate accurately when pressure is applied to it. i

11 is a perforated diaphragm, near the lower end of the exterior incloslng shell. and upon this diaphra n the annular 'washer (i rests and forms a]oint for the lower en d ot the transparent tube 'as previously described. From the conterI of this diaphragm a pin l2 extends axially downward. and its lowcr cud is preferably made concave. 4 I

rl`lu` lowcr cnil ofi'tlu cxtcrlor tulw I' is :ulaptcd to `rcst upon thc tube 13') ol' thc pneumatic air valu-.which is ciuploycd in se the Vto be inspected at night.

connection with tires of4 this class S0 that when the device is applied, the lower end of the. tube beingfplaced upon the end of the valve tube, and oi'ming a joint therewith, the fixed pin will contact with the stein of the air valve, thus unseating the air valve, and allowing air to enter the interior tube. This compressed air instantly forces the plunger up within its tube until compres sion equal to that. within the tire has been formed within the closed end of the tube. The amount of this compressi n is then read by the position of the plunger with relation I: i the graduations upon the tube,

l5 is au elastic sleeve or washer which fits int," the lower end of the exterior tube -l, arti :res to form a jointavith the valvecont owing tube so that by simply pressing the de'. ice upon said tube, and in alinement therewith, the joint is Jformed, and the valve is simultaneously unseated to allow the amount of compression to be shown as above described.

By this construction l am enabled to'dispense with all supplemental springs oi' projecting gage rods or stems, and to provide means forinstantly and accurately adjusting thevdevice and maintaining the plunger in a tight working;- condition.

The to o the plunger 3 is preferably coated with a suitable phosphorescent substance, sucli as glue, or lacquer mixed Vwith phosphorus, for the purpose of enabling it invention; what by Letters Patl-Iaving thus described my I claim ,and desire to secure ent is- 1. A pneumatic pressure age comprising inner and outer tubes, sait outer tube inclosing the lower portion of the inner tube and having an opening in 'its side through Vwhich the inner tube is exposed and having raduations on its side adjacent said opening, the inner tube being transparent and closed at one end and the outer tube having a removable cap at the upper end into which the fiper end of the transparent tube extends, a plunger operating within the inner tube and against which escaping fluid acts to :forni a pressure in the portion of said tube above this plunger, said graduations indicating the amount of pressure, an an elastic sleeve fitted inthe lower Aend of the exterior tube and serving to form a tight joint with a part towhich the gage is fitted. 9. A pneumatic pressure gage 'comprising inner and outer tubes, said outer tube inclosingr nthe lower portion of the Vinner tube an having an o ening in its side throughl .which inner tu e is ex osed and having graduations on its 'side a jacent said o ening, the inner tube being transparent an closed at Ione end and the outer tube having a removable cap at the upper end 4hieli the into, w upper end of the transpare t tube extends,

-ting a plunger operating within the inner tube and against which escaping fluid acts to 'torni pressure in the portion of said tube above the plunger, said graduations indicating the amount of said pressure, an elastic sleeve fitted in the lower end of the eX- terior tube and seiw'infgI to form a tight joint with a part to which the gage isfitted, and a ierforated diaphragm Within the outer tu e .and confined between the u )per end of said sleeve and the lower end ov the inner tube, said diaphragm having an outwardly proj eeting pin which extends beyond the lower end of the exterior tube.

3. An' improved pressure gage combination inner and outer tubes, said inner tube being closed at one end, and said outer tube inclosing the lower end of the inner tube and being open on the side to expose th'e inner tube and having a removable cap at the top to which the closed end of the inner tube is fitted, and a plunger operating in the inner tube, said plunger compressing fluid between itself and the outer' end of the inner tube, and said outer tube having graduations for indicating the amount of said compression.

i. A gageof the character described comprising an outer casing having an open and a closed end, and adapted to be fitted over a tire valve casing, said provided with a side opening and a pressure scale, a transparent casing with closed and open ends, fitted within said outer casing, and having its open end terminating at a short distance from the open end of the outer casing, ay piston consisting of a short plug fitting tightly within said transparent casing, and movable from end to end o said casing` a plug located in the open end of said outer casing, a member located between said piston and said plug and having a projection extending through said plug and adapted to actupon the tire valve to permit air parent easing, and more said piston longitudinally in the transparent casing to any distance.4 f y 5. A gage of the character described comprising a metallic outer casing provide with side openings and a transparent casing .having a closed and an open end2 and tightly fittinor within vsaid s n D 0 c outer casing and terminating a little dis*- said outer casing,

having in tance from one end of said outer casin ,being adapted to engage with the-tire va ve, aA piston oonsistintgo a short c linder with-heads at each en fitmovable fromend toend ofsaid casing by air pressure, a plug havingy a small per oration in itscenter located in the said lone c nd of said outer casing anda perforated j A located Vin` said outer casing between the plugaand the Apitoinsaid having a, stem' outer casing being,

from a tire to enter said transwitin said 'transparent casing' and d pressure scale, a

iis

extending through said plug, and adapted to -open the tire-valve and admit air from the tireito said transparent casing.

6. A gage comprising an inner transparent. easing having an open and e closed end, a metallic casing inclosing the saine and pro vided with sight openings and pressure scales, said metallic casing having an open end projecting beyond the open end of the transparent casing, a perforated washer held 1n Contact with the open end of said transparent casing1 a plug in said projected end of the metallic casing and provided 'with an opening, a perforated disk interposed between the plug and the washer, a stem for said disk projecting through the opening of huid plug and adapted to open a tire valve when the gage is in Contact with the casing thereof, and a piston slidable in said transparent casing and coperating with said scales to register the nir pressure from a tire.

In testimony whereof l have hereunto set niy hand in the presence of two subscribing w itnesses.

OLE OLSEN. lV i tnesses Funnies A. PnXrmLn, RAYMoNn A. Lnoxiinn. 

